With total apps surpassing 20,000 this month, the gap in size—and consequently, quality—between the Android Market and the iPhone App Store is finally starting to close.

AndroLib's been tracking new submissions stats since the Market opened—stats which don't just show us when Android apps pass arbitrary milestones, but how quickly it's happening. And to answer the implied question: very.

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There were more that twice as many new apps approved in the month of November than in July, and the rate of increase is only getting higher. Of course, raw app numbers don't guarantee that there will be anything worth downloading, but they do help. Even if just one in every 100 apps it worth downloading, the good stuff starts to add up pretty quickly. It's a sad formula! But it works out. [AndroidLib via MobileCrunch]